package com.mybatis.mybatisdatab.helper;

import com.mybatis.mybatisdatab.pojo.User;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;


/**
 * 拦截未登录的用户
 */
public class LoginInterceptor  implements HandlerInterceptor {

    @Override

    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object o) throws Exception {

//获取请求的RUi:去除http:localhost:8080这部分剩下的

        String uri = request.getRequestURI();

//UTL:除了login.jsp是可以公开访问的，其他的URL都进行拦截控制

        if (uri.indexOf("/login") >= 0) {

            return true;

        }

//获取session

        HttpSession session = request.getSession();

        User user = (User) session.getAttribute("USER_SESSION");

//判断session中是否有用户数据，如果有，则返回true，继续向下执行

        if (user != null) {

            return true;

        }

//不符合条件的给出提示信息，并转发到登录页面

        request.setAttribute("msg", "您还没有登录，请先登录！");

        request.getRequestDispatcher("classpath:templates/login.html").forward(request, response);

        return false;

    }

    @Override

    public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {

    }

    @Override

    public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {

    }


}
